The four-day search to find Benjamin James Milward is finally over. But the investigation into what happened to Sophie Collombet is far from finished.

Mr Milward, the person of interest in the case, was arrested in the NSW town of Coffs Harbour on Monday afternoon.

Police haven’t declared him a suspect in the case, but it is believed detectives have physical evidence linking him to the South Brisbane park where Ms Collombet was killed on March 27.

Person of interest Benjamin 'Benny' James Milward Photo: Facebook

The arrest has brought some short-term relief to Mr Milward’s family in Ipswich. Until Monday afternoon, he had been missing since the night Ms Collombet was killed.

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But their short-term relief is likely to turn once again to worry, as he faces extradition to Queensland and the possibility of being charged.

“It’s really hard ... I know it must be hard and heartbreaking for [the Collombet family]. Whatever they are feeling, we are feeling that here too,” Mr Milward’s aunt Tere Douglas said on Monday night.

Sophie Collombet .... Photo: Facebook.

Ms Douglas has primarily acted as the spokeswoman for the Milward family, and made several public pleas for her nephew to come forward to try to help ease the stress felt by the Collombet family in France.

Ms Douglas has fielded calls from numerous reporters and patiently answered their questions, ever since the 25-year-old was declared a person of interest on Friday.

“It’s really hit the family for a six,” Ms Douglas says.

Benjamin Milward's aunt Tere Douglas. Photo: Nine News

“We don’t see him as a monster. We honestly could not see him doing any of this ... that’s not the Ben that we know.”

Ms Douglas said Mr Milward had enjoyed a happy childhood and had been a good brother to his younger sibling Josh. Ben went through the usual teenage angst, she said, but it was after that things started to go downhill because he made “several choices which haven’t been good”.

Ms Douglas says there were several unanswered questions about what her nephew was doing on March 27.

In happier days ... Ben Milward with his brother Josh. Photo: Facebook

“We haven’t asked because Ben wasn’t around. Now we’ve found Ben, I guess some of the answers are going to come out,” she said.

The Milward family haven’t had a chance to speak with Ben, but expect that to happen when he faces court in Queensland.

When asked what the family would do now, Ms Douglas said they would be sticking by him.

Footage of Benjamin James Milward, captured at Bowen Hills train station on Thursday, March 27. Photo: Queensland Police

“[We'll] sit behind him in that court and support him all the way, as a good family would do. It’s like a marriage, for better and for worse. And that’s what the relationship in this family is, for better and for worse.”